问题 问答题 简答题

简述蓄水池(涝池,塘堰)。

答案

参考答案:

蓄水池定义:

在地面挖坑成以拦蓄地表径流为主而修修的,蓄水量在50~1000m^3的蓄水工程。

功能:

1.拦蓄地表径流

2.充分和合理利用自然降雨或泉水。

3.就近供耕地经济林果灌溉和人畜饮水需要。

4.减轻水土流失。

位置选择:

1.乡村附近,路边,梁峁坡和沟头上部2池址土质应坚实,最好是黏土或黏壤土。

2.应该注意以下1有足够的水源来水量2池底高于被灌溉的农田地面,以便自流灌溉3离沟头的距离为沟深的2~3倍,以防渗水引起坍塌。

多项选择题
单项选择题

For the people who have never traveled across the Atlantic the voyage is a fantasy. But for the people who cross it frequently one crossing of the Atlantic is very much like another, and they do not make the voyage for the (56) of its interest. Most of us are quite happy when we feel (57) to go to bed and pleased when the journey (58) . On the first night this time I felt especially lazy and went to bed (59) earlier than usual. When I (60) my cabin, I was surprised (61) that I was to have a companion during my trip, which made me feel a little unhappy. I had expected (62) but there was a suitcase (63) mine in the opposite corner. I wondered who he could be and what he would be like. Soon afterwards he came in. He was the sort of man you might meet (64) , except that he was wearing (65) good clothes that I made up my mind that we would not (66) whoever he was and did not say (67) . As I had expected, he did not talk to me either but went to bed immediately.
I suppose I slept for several hours because when I woke up it was already the middle of the night. I felt cold but covered (68) as well as I could and tried to go back to sleep. Then I realized that a (69) was coming from the window opposite. I thought perhaps I had forgotten (70) the door, so I got up (71) the door but found it already locked from the inside. The cold air was coming from the window opposite. I crossed the room and (72) the moon shone through it on to the other bed. (73) there. It took me a minute or two to (74) the door myself. I realized that my companion (75) through the window into the sea.

A. draft B. voice C. air D. sound